Problem with Stihl FS36

Hi, i have a Stihl FS36 that i brought from a work mate, anyway when i brought it it wouldnt rev out properly, and it idled too high, as soon as i dropped the idle it dies.
Ive replaced spark plug, cleaned out muffler, took out mesh spark arrester, and cleaned air filter. Also striped and blew out carbie, everything is spotless and looks fine.
But now it will start and only run for about 5 seconds, then stops. I have mixture screws at Low@1.25turns and Hi@1.5 turns out. Not sure what else to try?
Any help appreciated, cheers.

I didn't see anything about the fuel filter, Was it replaced ? There is a fuel screen inside the carb., It will varnish over and look good until you spray carb. choke cleaner through it then you can see how it was clogged.

piston slapper;4647585 said:

You never learn anything until you admit you don't know it all...

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MannsLawnService;5126387 said:

some times the man in my mirror isn't so smart...

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"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!​

Thanks for reply, i forgot to mention i pulled the fuel filter off and tried it with no filter, same problem. Its now back on, fuel flows thru all fuel lines, theres also heaps of compression and nice spark, it might be going for a trip to the tip shortly. Will probably buy a new Honda four stroke i think.

Have you tried quick start into the carb to see if you can keep the unit running beyond the 5 seconds? Any chance the fuel lines are not tight onto the carb? Any if this unit has a purge line are you sure you didn't get them switched around? If this is a two stoke it will run, don't give up on 2 stroke stuff.